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Dengan:
Sehingga,
b.)
Dengan aturan dalil rantai
= 4.3x³
= 12x³
turunkan nilai sin5x
= 5sinx
sekarang turunkan sin-nya
= cos5x
turunkan nilai 5x
= 5
kalikan semua :
12x³ . 5 sinx . cos5x . 5
= 12x³ . 25 sinxcosx
==========
cos^5 (2x³ - x²)
turunkan nilai cos^5
= 5cos^4(2x³ - x²)
turunkan cos-nya
= -sin(2x³ - x²)
turunkan 2x³ - x²
= 6x² - 2x
= 5cos^4(2x³ - x²) . -sin(2x³ - x²) . 6x² - 2x
= 30x² - 10x cos^4(2x³ - x²) . -sin(2x³ - x²)